Estimation of the Drop Size in Dispersed Flow

Agafonova, N. D.; Paramonova, I. L.

doi:10.1007/s10891-016-1444-2

Cited by 11 publications

(5 citation statements)

References 11 publications

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“…Coordination of the above tasks can be performed by the group of experts [26][27][28][29][30] representing design bureaus and research institutes and production facilities manufacturing heat exchange equipment for NPPs.…”

Section: Discussionmentioning

confidence: 99%

Russian and foreign steam generators for NPP power units with wet steam turbines

et al. 2020

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The main aim of the current study is to analyze advantages and shortcomings of horizontal and vertical types of steam generator design. Design solutions and experience of operation of steam generators of horizontal type accepted in Russia and of vertical type applied by Westinghouse, Combustion Engineering, Siemens, Mitsubishi, Doosan were analyzed within the framework of the present study. It was established that steam generator equipment of horizontal type is characterized by disadvantages of design, technological and operational nature. Thus, horizontal steam generators with dimensions permissible for railroad transportation and, for VVER-1200 with reactor vessel diameter equal to 5 m, by water transport as well, have exhausted the possibilities for further significant increase of the per unit electric power. The demonstrated advantages of vertical-type steam generators are as follows: 1) absence of stagnant zones within the second cooling circuit; 2) uniformity of heat absorption efficiency of the heating surface that ensures improved conditions for moisture separation; 3) increased temperature drop with parameters of generated steam elevated by 0.3 – 0.4 MPa. Conclusion was made on the advisability of introduction of steam generators with vertical-type layout in the Russian nuclear power generation.

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Section: Discussionmentioning

confidence: 99%

Russian and foreign steam generators for NPP power units with wet steam turbines

et al. 2020

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“…At the initial period of devices design, naturally, there was no their long-term operation experience. Moreover, many features of the medium flow processes, heat and mass transfer in them had not been sufficiently studied [7][8][9][10]. They were investigated only on smallscale models and did not take into account the scale factor, the geometry specifics of the systems and moisture separation and reheating processes [11][12][13][14][15][16][17].…”

Section: Some Thermal-hydraulic Processes Features In Msr Revealed During Their Operationmentioning

confidence: 99%

The new ways to increase the efficiency of thermal hydraulic processes in systems of separation and reheating of NPP wet steam turbines

et al. 2020

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Systems of moisture separators - reheaters (SMSR) were created simultaneously with the powerful turbines development of nuclear power plants operating on a wet steam from the early 60s of the 20th century. This lengthy experience made the opportunity to identify the moisture separators - reheaters (MSRs) drawbacks, to determine the objectives for their design and computation improvement in order to increase thermodynamic efficiency, MSR devices and MSR systems reliability in general. Based on maintenance experience and results of our and other researchers’ model and field studies this article discusses potential ways of further development and improvement, taking into consideration both SMSR components (separation and reheating) under conditions of their flow in one apparatus.

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“…The droplets size distribution is greatly important in calculating the separation efficiency. The volumetric distribution of droplets by size in the dispersed-annular flow of the wave-type vane separator is [12]:…”

Section: Droplets Size Distributionmentioning

confidence: 99%

Numerical investigation of a moisture wave-type vane separator

2019

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This study aims to determine the appropriate method for modeling separation processes in wave-type moisture vane separators and to analyze possible design improvements of the typical wave-type vane separator using numerical simulation methods. It discusses conditions of the secondary droplets generation phenomena. The applicability of the particle transport method for modeling the working process in wave-type vane separators is confirmed. The study explores the water droplets distribution pattern in the dispersed two-phase flow of a separator. A numerical study of the workflow in the typical steam-water separator with wave-type vanes was carried out. A dispersed two-phase flow in a separator is modelled as two separate flows. Dry saturated steam is considered as a continuous medium using the Euler method; the liquid phase is represented as a stream of water droplets described by the Lagrange method. Authors propose an option of modernization of the separator design applying three drainage channels on the path of small droplets.

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Estimation of the Drop Size in Dispersed Flow

Cited by 11 publications

References 11 publications

Russian and foreign steam generators for NPP power units with wet steam turbines

Russian and foreign steam generators for NPP power units with wet steam turbines

The new ways to increase the efficiency of thermal hydraulic processes in systems of separation and reheating of NPP wet steam turbines

Numerical investigation of a moisture wave-type vane separator

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